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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Jaime Casanova <jcasanov@systemguards.com.ec>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: decibel <decibel@decibel.org>
Cc: psql performance list <pgsql-performance@postgresql.org>
Subject: Re: [PERFORMANCE] work_mem vs temp files issue
Date: Wed, 13 Jan 2010 09:45:11 -0500
Message-ID: <10185.1263393911@sss.pgh.pa.us> (raw)
In-Reply-To: <3073cc9b1001122231m1a15d187lae2a8096a813361b@mail.gmail.com>
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	<B43373EF-4CFC-4643-AB6E-5BC0D4A7EB58@decibel.org>
	<25315.1252881420@sss.pgh.pa.us>
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	<18803.1263241120@sss.pgh.pa.us>
	<3073cc9b1001122231m1a15d187lae2a8096a813361b@mail.gmail.com>

Jaime Casanova <jcasanov@systemguards.com.ec> writes:
> why we don't show some of that info in explain?

Lack of round tuits; plus concern about breaking programs that read
EXPLAIN output, which I guess will be alleviated in 8.5.

> the reason i say "most of the temp files" is that when i removed
> #ifdef HJDEBUG it says that in total i was using 10 batchs but there
> were 14 temp files created (i guess we use 1 file per batch, no?)

Two files per batch, in general --- I suppose some of the buckets
were empty.

			regards, tom lane



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